Fix spelling mistakes (#271)

diff --git a/cmp/cmpopts/equate.go b/cmp/cmpopts/equate.go
index e4ffca8..62837c9 100644
--- a/cmp/cmpopts/equate.go
+++ b/cmp/cmpopts/equate.go
@@ -111,7 +111,7 @@
 
 func (a timeApproximator) compare(x, y time.Time) bool {
 	// Avoid subtracting times to avoid overflow when the
-	// difference is larger than the largest representible duration.
+	// difference is larger than the largest representable duration.
 	if x.After(y) {
 		// Ensure x is always before y
 		x, y = y, x
diff --git a/cmp/compare_test.go b/cmp/compare_test.go
index 5cdce37..5f02a82 100644
--- a/cmp/compare_test.go
+++ b/cmp/compare_test.go
@@ -515,7 +515,7 @@
 		wantPanic: "non-deterministic or non-symmetric function detected",
 		reason:    "non-deterministic filter",
 	}, {
-		label: label + "/AssymetricComparer",
+		label: label + "/AsymmetricComparer",
 		x:     []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
 		y:     []int{10, 9, 8, 7, 6, 5, 4, 3, 2, 1},
 		opts: []cmp.Option{
@@ -1288,8 +1288,9 @@
 		}(): 0},
 		reason: "printing map keys should have some verbosity limit imposed",
 	}, {
-		label:  label + "/LargeStringInInterface",
-		x:      struct{ X interface{} }{"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam sit amet pretium ligula, at gravida quam. Integer iaculis, velit at sagittis ultricies, lacus metus scelerisque turpis, ornare feugiat nulla nisl ac erat. Maecenas elementum ultricies libero, sed efficitur lacus molestie non. Nulla ac pretium dolor. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Pellentesque mi lorem, consectetur id porttitor id, sollicitudin sit amet enim. Duis eu dolor magna. Nunc ut augue turpis."},
+		label: label + "/LargeStringInInterface",
+		x:     struct{ X interface{} }{"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam sit amet pretium ligula, at gravida quam. Integer iaculis, velit at sagittis ultricies, lacus metus scelerisque turpis, ornare feugiat nulla nisl ac erat. Maecenas elementum ultricies libero, sed efficitur lacus molestie non. Nulla ac pretium dolor. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Pellentesque mi lorem, consectetur id porttitor id, sollicitudin sit amet enim. Duis eu dolor magna. Nunc ut augue turpis."},
+
 		y:      struct{ X interface{} }{"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam sit amet pretium ligula, at gravida quam. Integer iaculis, velit at sagittis ultricies, lacus metus scelerisque turpis, ornare feugiat nulla nisl ac erat. Maecenas elementum ultricies libero, sed efficitur lacus molestie non. Nulla ac pretium dolor. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Pellentesque mi lorem, consectetur id porttitor id, sollicitudin sit amet enim. Duis eu dolor magna. Nunc ut augue turpis,"},
 		reason: "strings within an interface should benefit from specialized diffing",
 	}, {
diff --git a/cmp/path.go b/cmp/path.go
index f01eff3..c710034 100644
--- a/cmp/path.go
+++ b/cmp/path.go
@@ -178,7 +178,7 @@
 	unexported bool
 	mayForce   bool                // Forcibly allow visibility
 	paddr      bool                // Was parent addressable?
-	pvx, pvy   reflect.Value       // Parent values (always addressible)
+	pvx, pvy   reflect.Value       // Parent values (always addressable)
 	field      reflect.StructField // Field information
 }